Water-tube boiler.



No. 200,248. Patented lay 20, I902.

.1. A. SCOTT.

WATER TUBE BOILER.

, (Application flied June 12, 1901.) (No Model.) 5 Sheets-Shut I.

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Patented May 20, I902.

J. A. SCOTT.

WATER TUBE BOILER. (Application filed June 12, 1901.$

5 Sheets-Sheet 2.

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No. 700,248. Patehted May 20, I902.

, J. A. sum.

WATER TUBE BOILER.

(Application filed June 12, 19013 (No Model.) 5 Sheets-Sheet-S.

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Patented May 20, I902.

.l. A. SCOTT. WATER TUBE BOILER. IIAPPIiM 'II tiOD filed June 12, 1901.

5 Sheets-She s! 4.

(No Model.)

No. 700,248 Patented May 20, I902.

v .1. A. SCOTT.

WATER TUBE BOILER.

[Application filed June 12, 1901.)

(No Model.,

5 Sheets-Sheet 5,

UNITED STATES PATE T 7 OFFICE.

JOSEPH ALVAH SCOTT, OF YONKERS, NEW YORK.

WATER-TUBE BOILER.

srnorrtca'rion smeg a of Letters Patent No. 700,248, dated May 20, 1902. Application filed June 12,-,19Q1. Serial No. 64,264. (No modeL) .To all whom it :may concern: 1

Be it known that I, JOSEPH ALVAH SCOTT, a citizen of the United States, residing at Yonkers, in the county of Westchester and State of New York,have invented certain newand useful Improvements in-Water-Tube Boilers, of which the following is a specification.

This invention relates to the general class of boilers or steam-generators in which waterdrums below are connected to a steam-drum and separator above by upwardly-extending water-tubes; and the. object of the present invention is to cause the currents of hot gases on theirway to the stack topass to and fro through and among the subdivided groups of tubes, the paths'of the currents being substantially at right angles to the axes of the tubes.

. zontal section taken substantially at'line x in Fig. 1. Fig. 4 illustrates a slight modification in the arrangement of the central'rnass or group'of water-tubes. This view is a sectional front elevation similar to Fig. 1. Fig.

' 5 is a horizontal section at'line t in Fig. 4.

1 designates the outer casing; 2, the grates; 3'and 5,the water-drums, ot'which there are three, one at the center and one at each side.

4 is the steam-drum or separator, situated directly above the central waterdrum 3.

The lateral water-drums 13 are connected to the central drum exterior'to the casing by pipes 5, one of which is seen in full lines in 2. 1 i v b is the breeching, which leads the gases" of combustion to the stack 8. r w I p Y The generator is composed of two like and symmetricalhalves'situated at each side of the'central line seen in Fig. 1, and the arrangement of the grate and water-tubes at one side being a'counterpart of those on the other it will only be necessary in general to illustrate and describe the construction and arrangement at onev side ,or one-half ;of the boiler.

. .Referring.particularly. to Fig. 1, where the groups of'tubes are seen from the front of the boiler and looking. toward the back, 6- designates a central sectional group of, watertubes extending practically vertical from the central water-drum 3 up to the separatordrum 4.. 6 is a sectional group of bent tubes the separator-drum above. group of tubes bends out or away from the axis or center line of the boiler. 7 is a sectional group ofbent water-tubes next to the.

an outer water-drum 3? with the separatordrum', and 7 is another sectional group of bent water-tubes also connecting the same outer water-drum with the separator. These" several sectional groups of tubes at one side of the boiler may be considered for "convenience in understandingbetter the purpose and operation of the boilerastwo main groups of tubes each parted or subdivided into sec tions by casings 8' for purposes of circulation of the gases, as will be explained with especial reference to Figs. 2 and 3.

nate bytransverse casings 8 Theinner tiers if .85,

of the water-tubes of the sectional groups 6 and 7 will be placed close together abreast, as seen at'lO in Fig. 3, so as to form ;a-close outer side wall of thecasing and connecting wall back] to, say, three-fourths of the depth" of the boiler from front torear, and beyond I this point the alternate tubes of this wall will be set out, as seen at 11 in Fig. 3, to allow the hot gases to pass into themass of tubes. The course ofthe gases is clearly illustrated by They flow back he the arrows in Fig. 3. tween the walls 10 until they reach the points 11. Here the current divides, a part'ene tering among the tubes of the sectional group 6 and a part among-those of the sectional group '7. The casings 8 compel the gases to flow forward amongathe tubes of these groups to'th'e' fronte'nds'of the casings,

or where the transverse casings 8 are situ-f ated.v Beyond this pointthey pass overto the respective sectional groups of tubes6 and 7 and thence back through these latter groups .to the breeching and stack. In their new to 6d also connecting the central Water drum with j r v This massor and fro among the tubes of the groups the gases move transversely of the axes of the tubes and impinge upon them in a manner to utilize the heat of the gases in the most efficient manner.

The spaces 9 afiord convenient access to the tubes for cleaning or repairs after the casings 8 are removed.

As will be noted by inspection at the left in Fig. 1, the front of the boiler is made up of casing-sections 12, which conform somewhat in shape to the spaces between the sectional groups of water-tubes, whereby the casings 8 can be reached for removal by taking ofl": the appropriate sections 12 at the front.

In Fig. 1, 13 represents a curved dash-plate in the drum 4 in front of the ends of the tubes of the group 7, which enter above the water-line. This plate serves as an inclined deflector to deflect the incoming water from the tubes downward and prevent it from impinging on the steam-main 14 in the upper part of the drum. This main may be perforated in the usual way. (Not herein illustrated.) The dash-plate at the other side of the drum is indicated by dotted lines.

Fig. 4. illustrates a slightly-different construction and one especially adapted for boilers of lesshorse-power. In this construction the outer sectional groups of tubes 7 and 7 are more inclined and have a less number of individual tubes, and the inner or middle group of tubes 6 is subdivided so as to leave a space 9 at the center of the boiler. This space extends back to the entire depth of the boiler. Otherwise the construction is substantially the same as in the principal figures.

It will be noted, as hereinbefore intimated, that the water-tubes of the boiler are really comprised in three major groups or clusters connecting the respective water-drums with the steam-drum and that each of these major groups is subdivided through a part of its depth by the casings into sectional groups which merge at the front of the generator. In Fig. l the central sectional groups 6 merge into one group; but in Fig. 4 this group is separated by the space 9 Fig. at is a horizontal section of this form of the boiler, showin g how the casings are arranged and how the currents of gases flow. The middle space 9* is not open to the flow of the gases. and the space 9 between the groups of tubes does not extend to the back wall of the fire-box, as in Fig. 3. The gases flow forward and divide, entering on the one hand the group of tubes 6 and on the other hand the groups of tubes 7 and 7. After entering the masses of tubes the gases flowback to the breeching and stack. The space 9 between the groups of tubes 7 and 7 divides the gases into two currents as they flow back.

I do not wish to limit myself strictly to the arrangement of the groups of tubes as herein shown, as this may be varied somewhat without departing materially from my invention. For example, it will be obvious that in cases where access from without can be had for cleaning the two exterior groups, as 7 and 7 might be merged in one.

Having thus described my invention, I claim 1. A water-tube boiler having a group of tubes extending upwardly to the steam-drum and separated into two divisions, and having a tight, hollow casing between said divisions, said casing being closed at its end and extending from one end of the outer boiler-easing the major part of the distance to the other end of the boiler-casing, whereby the gases are compelled to flow from one end to the other in one section or division of the group of tubes, and in the opposite direction in the other division thereof, substantially as set forth.

2. A water-tube boiler havingits groups of tubes subdivided throughout a part of their depth by spaces to afford access for cleaning and the like, and casings Within said spaces which bar the entrance thereto of the gases, whereby the latter are barred from direct passage through the mass of tubes, substantially as set forth.

3. A water-tube boiler having two outer water-drums, a central water-drum, grates between the outer and central water-drums, a steam-drum above and over the central water-drum, bent water-tubes connecting the outer water-drums with the steam-drum, upright water-tubes connecting the central water-drum with the steam-drum, and casings subdividing the groups of tubes for the major portion of the depth of the generator to compel the gases, on their way to the stack, to circulate in opposite directions through said subdivisions, substantially as set forth.

4. A watertube boiler having two outer water-drums, a central water-drum, grates between the outer and central water-drums, cross-pipes connecting the outer and central water-drums, a steam'drum above and over the central water-d rum, water-tubes connecting the outer water-drums with the steamdrum, water-tubes connecting the central water-drum with the steam-drum, the furnacetubes forming a Wall or crown-sheet for the major part of the length of the boiler compelling the gases to enter the clusters of tubes at one end and pass among the tubes to the other end into the uptake, and a casing subdividing the central group and covering the outer groups, said casing being removable to J OS EPII ALVAH SCOTT.

lVi tnesses: 1 PETER A. Boss, F. W. DIMAN. 

